Fuse-plug.



W. S. MKCLEWEE;

FUSE PLUG. APPLICATION FILED 8EPT- 28. 1916.

1,243,851 Patented 00m. 23, 1917.

avwcn for,

William SMaaLeI/bee UNITED STATES PATENT OFFICE.

. WILLIAM s. maonnwnnor rannnnr, rnimsrnvanra assrcnon 'ro CARRIE HOWELL MADLEWEE, 0F YARDLEY, PENNSYLVANIA.

' FUSE-Pane.

Specification of iettei's latent.

Patented Oct. 23, 1917.

Application filed September 28, 1916. Serial No. 122,603.

tain new and useful Improvements in Fuse.

Plugs, of which the' following isa specification.

'My' inventionrelates to i-mprovements in as formed from the metal forming the bota fuse plu and the object of my""invention is to simp ify the construction of the fuse plug and facture; a further object of my invention is to construct the several parts of the fuse plug so that they may be readily assembled; and a still further object of my invention is to form the parts so that all adjacent surfaces thereof will lie flat and even, thus permitting them to be tightly clamped together without leaving any crevices for the escape of fire when the fuse is blown.

Referring to the accompaniying drawlng; Figure 1. is a erspective view of my 1 mproved fuse; ig. 2. is a vertical sect on through the fuse; Fig. 3. is a perspective view of the inner fiber washer, detached; Fig. 4. is a plan view of the blank for forming the fiber washer shown in Fig. 3; Fig. 5. is a vertical section of the metal sleeve, detached; and Fig. 6. is an end view of the metal sleeve, showing the manner of cutting the contact plate from the bottom of the blank forming the metal sleeve.

In the drawings in which like references refer to like parts 1, represents the body portion of the fuse, made of porcelain or other insulating material. The reduced cylindrical portion 2 of the body 1 is provided with a screw thread adapted to receive the metal sleeve 3, also having a screw thread formed thereon. The metal sleeve 3 is securely locked on the body portion by the edge of the metal being indented into a recess 5 formed in the body portion.

To facilitate in locating the recess 5, in the body portion, when the fuse plug is placed in a press to indent the metal sleeve, an annular shoulder 6, is formed upon the body portion. Said shoulder 6 is of larger diameter than the metal sleeve and is provided with a slot or recess which is an extension of the recess 5, into which the metal sleeve 3 is indented. When the fuse plug is placed in the press the slot 5 formed in the thereby reduce the cost of manuenlarged shoulder is made to embrace a projection onthe press, thus insuring the metal .sleeve being indented directly over the recess in the body portion and avoiding the possibility of.breaking the porcelain body portion. v r 1 .The metal sleeve 3 isprovided with a contact plate 8, to which one end of the fuse wire--9 1s1so1dered.= Said-contact plate 8 tom of the metal sleeve 3, as shown in Fig. 6. The contact plate 8 is bent inwardly so that it will enter the interior of the metal sleeve and leave a space for the body portion to be screwed into the metal sleeve without interfering with the contact plate 8. The latter is also provided with a rightangle bend at its free end to form a broad surface 10, to which the fuse wire 9 may be securely soldered.

The metal sleeve 3 is provided with an inwardly turned flan e 12, which is clamped between two fiber disks 14 and 15 by the center contact button 16, which is made in the form of a rivet and to which one end of the fuse wire is soldered to complete the electric circuit.

The inner fiber washer 14: is made, as shown in Figs. 3 and 4, with a tongue 18, which is bent at right angles with the washer and said tongue 18 extends between the contact plate 8 of the metal sleeve 3 and the fuse wire 9.

The outside fiber washer 15 is securely clamped against the flange 12 of the metal sleeve, which tightly seals the fuse plug and prevents the escape of fire. The fiber washers 14 and 15 may be secured to the metal sleeve and the fuse wire soldered to the contact points before the body portion is screwed into the metal sleeve. The parts are securely held in their proper places by the central contact button 16 without depending upon the body portion holding said parts in their proper positions.

Having thus described my invention I claim and desire to secure by Letters Patent:-

1. In a fuse plug the combination of a metal sleeve, a contact plate formed upon the bottom portion of the metal sleeve and bent inwardly, insulating washers, a central contact button upon said washers, a fusible member connecting the contact plate of the turned edge of the contact plate, insulating washers, a central contact buttonupon said Washers to Which said-fusible member is attached and a body portion to which said metal sleeve is secured. i

3. In a fuse plug the combination-of a body portion, a metal sleeve, a contact-plate upon the bottom of the sleeve extending inwardly, an insulating Washer between the body portion and the bottom of the --metal sleeve, a tongue upon said insulating Washer .e xtending inwardly adjacent to the said con- Copies 01' this patent may be obtained for five cents gaql by addressing the Gommis sioner o1 Patents,

i 1 washington ng. 

